These are the absolute coolest variety of Cool Shades. Rather than those frightfully dull elliptical, circular, or square lenses, the lenses in these shades are in the shape of scalene triangles, joined at one point and with the shortest sides resting on the bridge of the nose. They are often, but not always, worn by lowlife hoodlum characters. There's even an emoticon for them: ◥▶◀◤﻿

Aren't they cool?

A variation is for robots to have their actual eyes in this shape. This serves no purpose other than looking cool.

Examples — sunglasses

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Anime and Manga

Kamina of Tengen Toppa Gurren Lagann starts off with a pair, and everybody gets in on the act towards the end of the series. They've become so associated with him and considered such a defining trait that "Kamina shades" is a very common term used to refer to this style of sunglasses.

It's also rumoured that if anybody puts on Kamina's shades, they will instantly be promoted to Memetic Badass status. It's become a meme to Photoshop Kamina's glasses onto various people◊, places, flags◊...which, well, instantly promotes them to Memetic Badass status. It even fixes hated characters such as Starchild◊.

The shades have become so iconic in their role of turning the wearer into a Memetic Badass that in some circles the shades by themselves have gained Memetic Badass status.

Simon tops it off towards the end of the series, with his shades becoming star-shaped! ( which is like the original, with three pointed tips added)

And topped off once more with Super Tengen Toppa Gurren Lagann in Lagann-hen which manifests galaxy-sized Kamina's shades. No, that's not a typo there.

Pokémon has an example that predates Kamina's: Ash's Squirtle has a pair that he whips out every now and then, which signifies his role as The Leader of the Squirtle Squad (the other Squirtle instead wear Lennon Specs). So do various members of Team Rocket, especially Meowth.

Ghost Trick's Sissel has a pair of these. Yomiel, the person whose body Sissel mistakenly thought was his, has these too. These carry on even after Sissel loses Yomiel's image and reverts to the blueish blob shape all ghosts start out as and Yomiel seems to have drawn a pair of triangle shades onto his "face" after pulling a body together out of random items he found in the submarine.

Some of the Animal Crossing games feature triangle shades for your character to wear.

And the final kicker is that Gurren/Gurren Lagann's shades can be used as an Improvised Weapon, being used as a sort of boomerang by Kamina and Simon, as well as the first strike of their Finishing Move, the Giga Drill Breaker!!

Comic Books

ABC Warriors: These robotics warriors enjoy this trope. Depending on their current bodies, at least a few of the titular robots have them at any one time. Hammerstein and Mek-Quake are the most fond of theme.

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